Java
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Jpa-2.0 – execute @ postload_ after_ Eagerly extract?
Using JPA2 / Hibernate, I created an entity a with a one-way mapping to entity x (see below) In a, I also have a tempo…… -
How do I register JavaScript callbacks in a java applet?
I'm developing an invisible Java applet that will be completely controlled by JavaScript I can easily call the Java me…… -
Java – how to disable errorpagefilter in spring boot?
I am creating a soap service that should run on Tomcat @Configuration @EnableAutoConfiguration(exclude = ErrorMvcAutoC…… -
Java – automatically redirect from one JSP page to another
Once the home page is loaded, can users be automatically redirected to the second JSP page@ H_ 502_ 2@ resolvent Solut…… -
Using Java’s recursive expression evaluator
I want to write an expression evaluator that only does addition and subtraction I have a simple algorithm to do this; …… -
Java – does JSF use JSP?
I'm learning JSF and I have some questions I know JSF is a UI framework for making pages. I'm using it and successfull…… -
Java – error adding edit text in eclipse
I'm building Android apps for tablets I tried to add an EditText in the graphical view of eclipse, but when I selected…… -
Java – what is the meaning of the three points in the function parameters?
There is already an answer to this question: > java, 3 dots in parameters8 private class DownloadFilesTask extends …… -
Java – how does akka implement the relationship before JMM?
In the official akka document, they refused: For details, please refer to the doc I wonder how akka did it I just pass…… -
Java – what are the benefits of extending generics by specifying new types as the actual types of generics
I saw this pattern somewhere: @ h_ 403_ 2@class A extends B { } This structure is somewhat unusual for extending gener…… -
Java – JPA: @ primarykeyjoincolumn (…) and @ joincolumn (…, insertable =?, updatable =?) Same?
It can be derived from the JPA specification if there is no @ primarykeyjoincolumn (...) with pluggable and updatable …… -
Java – how do I get the hashtable value as an ArrayList?
Hashtable How to convert its value to: ArrayList <Word> arr thank you. Solution Use the ArrayList constructor t…… -
How to install the gson module in Java?
I downloaded the Google JSON module a.k.a gson I am a Windows system. Can you tell me how to install the gson module? …… -
Java – spring data dynamic query
I am using spring data to set up a dynamic query. Basically, I have an array with a series of features. I need to comb…… -
Can the Java – pluggable annotation processor API retrieve source code annotations?
I am using the pluggable annotation processing API with Java 6 to automatically create some deployment XML files Some …… -
Copying fields between classes in Java
I have a pair of classes. The field of one class is a subset of the field of the other. The getters of superset classe…… -
Java introspection – strange behavior
The following code is a small example that can easily reproduce the problem So I have a variable of type string and se…… -
Java – where to run complex algorithms? Server or client?
I'm trying to develop a social network Android application with a huge user database I am very new to android app deve…… -
Java – save files to SharePoint Server using jax-ws
I tried to save a file to a SharePoint Server using Jax - WS The web service call reports success, but the file is not…… -
Java – why is maptoint() not in the optionalint class?
The intstream class has map(), maptoobj(), maptolong() and maptodouble() methods, but these methods seem to be missing…… -
Java – how does akka implement the relationship before JMM?
In the official akka document, they refused: For details, please refer to the doc I wonder how akka did it I just pass…… -
Java – incompatible types and fresh type variables
I get the following compilation message: [javac] ... error: incompatible types [javac] exceptionClassHolder …… -
JavaFX – how to make ComboBox hgrow?
I have JavaFX (8), H@R_509_2419 @, Combo@R_509_2419 @And hgrow This is my fxml Code: <?xml version="1.0" encoding="…… -
Java – you can mark interfaces, such as serializable, which contains default methods?
I don't think it can, because the principle of markup interface is that there is no method, but I don't know because t…… -
Java – should you report the message text of the exception?
Consider some code that can throw a check exception (an exception of type exception) Of course, your code catches exce…… -
java – Make Enum. Tostring() localization
I'm developing an Android application and I want to know if I can set enum Tostring() multilingual I'll use this enume…… -
Java – when to use servicetracker and servicereference
I've just started using OSGi programming, and I've encountered two ways to listen to activated services The first meth…… -
Parallelism and plan view in Java 8 streams
Hey, I have a problem with parallelism when I use flatmap IntStream.of(-1,1).parallel().flatMap(i->IntStream.range(…… -
Java – how do I know the number of worksheets in a workbook?
I use the HSSF API to read data from XLS files But there is no way to get the exact uncertainty Worksheet in workbook …… -
Java – the strange “reduce” method group is in the jdk8 batch collection operation library
Why does the new jdk8 stream class only contain the following reduce methods: T reduce(BinaryOperator<T> reducer…… -
Java 8: find the index of the minimum value from the list
Say I have a list of elements (34,11,98,56,43) Using the Java 8 stream, how do I find the index of the smallest elemen…… -
Java – generate thumbnails of websites?
For my application, I need to dynamically create thumbnails of the website So far, I have such code from so: public cl……